Biographies of the very rich and successful who started with nothing are usually very good. I look for common themes and key points in their lives. A few of my favorites:

Carnegie by Peter Krass, http://www.amazon.com/Carnegie-Peter-Krass/dp/0471468835/ref...

"Titan, The Life of John D. Rockefeller, Sr." by Ron Chernow, http://www.amazon.com/Titan-Life-John-Rockefeller-Sr/dp/1400...

"iWoz", by Steve Wozniak, http://www.amazon.com/iWoz-Computer-Invented-Personal-Co-Fou...